here's my take on this:
i too dont like senseless bumping without contributing and this primitive "moar" conduct, yet i still understand the reason, because when an interesting picture is posted somewhere it is very rarely the only stuff there is.
at least when it comes to amateur/wife/ex-gf stuff, these few photos initially posted somewhere are as good as always part of a set or collection, and i do understand that people, me included, want to see that entire collection, because it is out there. this is not so much the case with social media ladies who often distribute their nudes individually these days, so it truly is hard to get one big collection and therefore pointless to simply demand "moar". but, in defense of old believed-to-be-dead threads, it occured to me more than once that out of nowhere someone leaks material that people have been waiting for for years (e.g. check the Lauren S thread, almost a 5 years old thread, for a long time no real frontal nudes until 3 weeks ago some hero delivered them).